Surround Test is a surround sound testing app for checking the audio system surround effect performance. We have added a virtual helicopter flying over the listener and the movement is fully controlled by the screen arrow keys. Meanwhile, a missile can be fired by pressing the fire circle key on the right of the screen. It will further simulate a missile flying over the listener head. In order to help the user to locate the helicopter position more precisely, we have added the normal surround (FL/C/FR/L/R/RL/RR) keys at the top right corner such that the user can easy adjust the audio system. Please notice that this app is suitable for headphone system and other home theatre amplifier system with reasonable surround features. Mono or phone speaker will not feel the surround effect.